use versioneer for release tracking

- update CHANGELOG for release 1.3.1
- generated files with `versioneer install`
- use in setup.py
- use in docs (conf.py)

Author: orbeckst

.gitattributes

@@ -0,0 +1 @@
+rotcon/_version.py export-subst

CHANGELOG

@@ -11,7 +11,7 @@ The rules for this file:
 
 ------------------------------------------------------------------------------
 
-??/??/2020 orbeckst, lilyminium
+07/08/2020 orbeckst, lilyminium
   * 1.3.1
     - fix library.find_file (issue #32)
     - changed online docs theme (issue #35)

MANIFEST.in

@@ -4,4 +4,5 @@ recursive-include   doc *
 prune               doc/sphinx/build
 graft   rotcon/data
 recursive-include   tests *.sh *.gro *.dat *.pdf
-global-exclude      .DS_Store *~
+global-exclude      .DS_Store *~include versioneer.py
+include rotcon/_version.py

doc/sphinx/source/conf.py

@@ -62,10 +62,10 @@
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# The short X.Y version.
-version = u'1.3.0'
 # The full version, including alpha/beta/rc tags.
-release = u'1.3.0'
+release = __import__('rotcon').__version__
+# The short X.Y version.
+version = ".".join(release.split('.')[:2])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

rotcon/__init__.py

@@ -210,3 +210,7 @@ def get_license_string():
 def get_citation_string():
     return ("Please cite: LS Stelzl, PW Fowler, MSP Sansom, O Beckstein. " +
             "J Mol Biol 426 (2014), 735-751, doi:10.1016/j.jmb.2013.10.024")
+
+from ._version import get_versions
+__version__ = get_versions()['version']
+del get_versions